2 texidoc = "Span bars draw only in between staff bar lines, so setting those to transparent shows bar lines between systems only.
7 \notes \relative c' \context StaffGroup = groupie <
8 \context Staff = SA { c1 c1 c1}
9 \context Lyrics = LA \lyrics <
12 \context Staff = SB { a1 a1 a1}
13 \context Lyrics = LB \lyrics <
17 \context Staff = SC { f1 f1 f1}
18 \context Lyrics = LC \lyrics <
23 \context Staff = SD { d1 d1 d1}
24 \context Lyrics = LD \lyrics <
34 BarLine \override #'transparent = ##t